Four teams of three rebounders
The coach tosses the ball up for the 1st three players to battle for the rebound. The player that catches the ball is the attacker, and the remaining two players then try to stop the attacker from scoring.
The 1st player to make 2 baskets moves to the end of their line. The winner is the 1st team to get all 3 players through.
On a basket or ball that rebounds outside the key area, the ball is returned to the coach.
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.
Good spacing is only the start. The best modern offences teach players to attack the defence's rotations and play in a permanent 4-on-3 - here is how to coach that read.
The ball screen produces almost half of all professional offensive possessions, yet most teams still teach it as a memorised play. The modern approach trains the read - giving players a framework to decide based on what the defence does, not what the coach called.